Mitsubishi Electric Melservo-J4 Instruction Manual page 129

Description
The servo motor does not
operate.
Cause
The command pulse is not
inputted in the position control
mode.
The wiring of the command pulse
train signal is incorrect in the
position control mode.
The setting of the command pulse
input form is incorrect in the
position control mode.
Both of ST1 (Forward rotation
start) and ST2 (Reverse rotation
start) are on or off in the speed
control mode or the positioning
mode.
Both of RS1 (Forward rotation
selection) and RS2 (Reverse
rotation selection) are on or off in
the torque control mode.
The value selected in the speed
control mode or the torque control
mode is low.
The value selected in the
positioning mode (point table
method) with BCD input is low.
An analog signal is not inputted
correctly.
The ABS transfer mode is
selected when the absolute
position detection system is used.
The settings of the electronic gear
are incorrect.
The setting of point tables is
incorrect.
Checkpoint
Check if the pulse train is
outputted on the controller side.
Check the cumulative command
pulses using the status display or
MR Configurator2. Input the pulse
train command and check if the
display changes.
Check that the pulse train form
outputted with the controller and
the setting of [Pr. PA13] are
matched.
Check the status of ST1 (Forward
rotation start) and ST2 (Reverse
rotation start).
Check the status of RS1 (Forward
rotation selection) and RS2
(Reverse rotation selection).
Check SP1 (Speed selection 1),
SP2 (Speed selection 2), and SP3
(Speed selection 3), and then
check if the selected internal
speed is correct.
Check SPD1 (Speed selection 1),
SPD2 (Speed selection 2), SPD3
(Speed selection 3) and SPD4
(Speed selection 4), and then
check if the selected internal
speed is correct.
Check the values of analog speed
command and analog torque
command using status display or
MR Configurator2.
Check if ABSM is on.
Check the setting value of the
electronic gear.
Check the point table setting.
1 TROUBLESHOOTING FOR SERVO AMPLIFIER (DRIVE UNIT)
1.6 Trouble which does not trigger alarm/warning
Action
Review the setting on the
controller side.
Review the wiring. When the
signal is used in open-collector
type, input 24 V DC to OPC.
Review the [Pr. PA13] setting.
Turn on ST1 (Forward rotation
start) or ST2 (Reverse rotation
start).
Turn on RS1 (Forward rotation
selection) or RS2 (Reverse
rotation selection).
Review the selections of SP1
(Speed selection 1), SP2 (Speed
selection 2), SP3 (Speed
selection 3), and setting of internal
speed.
Review the wiring. Review the
selections of SPD1 (Speed
selection 1), SPD2 (Speed
selection 2), SPD3 (Speed
selection 3), SPD4 (Speed
selection 4), and setting of internal
speed.
Input the analog signals correctly.
Turn off ABSM.
Set a proper value of the
electronic gear.
Review the point table setting.
Target
[A]
1
[A]
[GF]
127